I have done this - with 1 BMS and 8S2P. It is the best way to go - instead of two paralell banks. There are a few things in paralell LiFePO4 banks you need to be cognizant of (maybe you already are).
1. If a cell voltage on one of the banks hits critical (either up or down) it will shut off that battery - then putting all the strain on one of them. This can lead to big time cell voltage issues.
2. In charging and discharging the banks they will change overall cell voltages between them even with balancing. One bank will want more power when the other one does not and vica versa with discharging. You will have to either bottom or top balance these banks and try and get them to the exact same SOC before you install them.
3. There is some good literature out there about running two LiFePO4 banks together and connecting the BMS' together through a serial connection - then they share the data. I have seen this on advanced BMS systems that are pre-made and the batteries put together. It means one of the BMS becomes primary the other one secondary - with the primary one controlling balance voltages. This is done on large racks of batteries that are in very large UPS systems with an RJ45 connection between them.
4. The resistance of each cell will change over time. Go back to 2 above.
5. There is also some great advice out there about not running the banks at standard low voltage settings and having to adjust them based on number 1 above. Most of the advice I have read says to ensure you are at about 30 to 90 percent SOC on your charge and discharge cycles, set the low voltage to the lowest cell for both banks, watch the charge cycles carefully and monitor the banks more frequently than you would an 8S2P.
Coming off the 8S2P 24V 200AH battery bank with the OKS BMS I had no issues except the loss (over time - 2 years) of resistance in one group of cells in the 8S configuration. This created a charging issue as the low resistance cells would ramp up to 3.65v way before the other ones got even close. I just deconstructed the battery and created 3 12v batteries from the remaining cells and ordered 8 X 280AH EVE cells to rebuild the bank.
Lastly, over the past three or four years building an off grid system, I have learned a lot. The biggest lesson I learned was to have a second bank of Lead Carbon (Great Batteries) available. This allows the system to continue to supply power while you re-configure, repair or re-construct the LiFePO4 bank. Also look at year round temperatures and make sure you have a battery heating system on the LiFePO4 system. We do not use the off grid system during the winter months and so keeping the LiFePO4 batteries from freezing is important. We also leave the system on the Lead Carbon bank over the winter months - they are much more resilient than the LiFePO4' are.
Not meaning to argue with you just sharing my experience.